feat(loader): check for wsc service before starting

defendnot/core/com.hpp

@@ -5,6 +5,7 @@
 #include <thread>
 
 #include "core/log.hpp"
+#include "shared/strings.hpp"
 
 #include <Windows.h>
 
@@ -53,6 +54,7 @@ namespace defendnot {
 
         if (delayed) {
             /// Sleep for additional 15 seconds to let WSC proceed all previous requests
+            /// \todo @es3n1n: there should be a better way to handle this
             std::this_thread::sleep_for(std::chrono::seconds(15));
         }
 
@@ -92,7 +94,12 @@ namespace defendnot {
     public:
         static IWscAVStatus* get() {
             IWscAVStatus* result = nullptr;
-            com_checked(CoCreateInstance(detail::CLSID_IWscAVStatus, 0, 1, detail::IID_IWscAVStatus, reinterpret_cast<LPVOID*>(&result)));
+            const auto status = CoCreateInstance(detail::CLSID_IWscAVStatus, 0, 1, detail::IID_IWscAVStatus, reinterpret_cast<LPVOID*>(&result));
+            if (status == REGDB_E_CLASSNOTREG) {
+                throw std::runtime_error(strings::wsc_unavailable_error().data());
+            }
+
+            com_checked(status);
             return result;
         }
     };